Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b1073ce2678720…

MALICIOUS

PDF

83.5 KB Created: 2021-08-10 17:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6f8fc4238feba4a823b4af0bf01feb6 SHA-1: c754b41e07994ae6d018524d8e24790d2a32d492 SHA-256: a9b1073ce267872047978f118d3952f0b7c1ff41de93ddf3daede43daacccdb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and embedded URLs point towards a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ge7flrnfh6gedgc4he64fsm5ma/rubemofeba.pdf
    • http://fioredda.com/userfiles/files/62761803921.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/miaoltmp0ug7hdop1hde327204/juxubaregogolikimoka.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb3d72bea---luporepotozilifudiva.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f341555ecd3---wadarisukutalate.pdf
    • http://www.deco-interieure.com/userfiles/file/93591761585.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/adb296ebf87d479171470178d1d9d012/21744771605.pdf
    • http://trendymamy.pl/userfiles/file/rurugovipebebipowosikexa.pdf
    • http://haiphongcontest.com/images/files/96367291432.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/21a797d5991345640115cbb983e08909/46630739930.pdf
    • https://neksav.com/upload/ckfinder/files/35304721279.pdf
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/bipuvujiluduleli.pdf
    • http://ankaser.com/userfiles/file/62934402525.pdf
    • http://al-bandak.com/userfiles/file/40733102233.pdf
    • http://fogathajtohirek.hu/fckfiles/file/mevuk.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f684041b02---75086505720.pdf
    • https://africanresearchcenter.com/userfiles/file/xabaxidosap.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0232c1f902---4602129877.pdf
    • https://stdtekstil.com/upload/ckfinder/files/35266216221.pdf
    • http://narnivet.com/userfiles/files/8493966599.pdf
    • http://beiks.info/public/file/jebik.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ba1a1c6bc---81863926514.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0c0b193fd06a0b9b6e1ac80362916a0a/papad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=peliculas+completas+en+espa%C3%B1ol+latino+danza+con+lobos
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de90.bin
f1c5bb3c5a85bba78e0fb757091eb51371f14dee5d6c48efea26ee37b8718026
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 11080 bytes
font_01_sfnt_off0000f7f8.bin
62db4afa1c6f2ef9f4cf74361ccf7fb3f7634d02fe90005fcd9f7e53aa1ee999
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 17808 bytes
font_02_sfnt_off000125b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 16792 bytes